9d44190e |
1 | /* |
2 | * relocate_kernel.S - put the kernel image in place to boot |
3 | * 2005.9.17 kogiidena@eggplant.ddo.jp |
4 | * |
5 | * LANDISK/sh4 is supported. Maybe, SH archtecture works well. |
6 | * |
7 | * This source code is licensed under the GNU General Public License, |
8 | * Version 2. See the file COPYING for more details. |
9 | */ |
10 | |
9d44190e |
11 | #include <linux/linkage.h> |
12 | |
13 | #define PAGE_SIZE 4096 /* must be same value as in <asm/page.h> */ |
14 | |
15 | |
16 | .globl relocate_new_kernel |
17 | relocate_new_kernel: |
18 | /* r4 = indirection_page */ |
19 | /* r5 = reboot_code_buffer */ |
20 | /* r6 = start_address */ |
21 | /* r7 = vbr_reg */ |
22 | |
23 | mov.l 10f,r8 /* 4096 */ |
24 | mov.l 11f,r9 /* 0xa0000000 */ |
25 | |
26 | /* stack setting */ |
27 | add r8,r5 |
28 | mov r5,r15 |
29 | |
30 | bra 1f |
31 | mov r4,r0 /* cmd = indirection_page */ |
32 | 0: |
33 | mov.l @r4+,r0 /* cmd = *ind++ */ |
34 | |
35 | 1: /* addr = (cmd | 0xa0000000) & 0xfffffff0 */ |
36 | mov r0,r2 |
37 | or r9,r2 |
38 | mov #-16,r1 |
39 | and r1,r2 |
40 | |
41 | /* if(cmd & IND_DESTINATION) dst = addr */ |
42 | tst #1,r0 |
43 | bt 2f |
44 | bra 0b |
45 | mov r2,r5 |
46 | |
47 | 2: /* else if(cmd & IND_INDIRECTION) ind = addr */ |
48 | tst #2,r0 |
49 | bt 3f |
50 | bra 0b |
51 | mov r2,r4 |
52 | |
53 | 3: /* else if(cmd & IND_DONE) goto 6 */ |
54 | tst #4,r0 |
55 | bt 4f |
56 | bra 6f |
57 | nop |
58 | |
59 | 4: /* else if(cmd & IND_SOURCE) memcpy(dst,addr,PAGE_SIZE) */ |
60 | tst #8,r0 |
61 | bt 0b |
62 | |
63 | mov r8,r3 |
64 | shlr2 r3 |
65 | shlr2 r3 |
66 | 5: |
67 | dt r3 |
68 | mov.l @r2+,r1 /* 16n+0 */ |
69 | mov.l r1,@r5 |
70 | add #4,r5 |
71 | mov.l @r2+,r1 /* 16n+4 */ |
72 | mov.l r1,@r5 |
73 | add #4,r5 |
74 | mov.l @r2+,r1 /* 16n+8 */ |
75 | mov.l r1,@r5 |
76 | add #4,r5 |
77 | mov.l @r2+,r1 /* 16n+12 */ |
78 | mov.l r1,@r5 |
79 | add #4,r5 |
80 | bf 5b |
81 | |
82 | bra 0b |
83 | nop |
84 | 6: |
85 | #ifdef CONFIG_SH_STANDARD_BIOS |
86 | ldc r7, vbr |
87 | #endif |
88 | jmp @r6 |
89 | nop |
90 | |
91 | .align 2 |
92 | 10: |
93 | .long PAGE_SIZE |
94 | 11: |
95 | .long 0xa0000000 |
96 | |
97 | relocate_new_kernel_end: |
98 | |
99 | .globl relocate_new_kernel_size |
100 | relocate_new_kernel_size: |
101 | .long relocate_new_kernel_end - relocate_new_kernel |